论文部分内容阅读
针对渝湘高速公路斑竹林隧道软弱围岩洞口浅埋偏压段施工难题,采用数值模拟手段对施工过程进行计算分析。分析计算结果,得出主要结论:水平方向的围岩变位相对比较大,可能大于隧道围岩竖向位移;右隧道(埋深大)围岩拱顶特征点处竖向位移大于左隧道,围岩位移值最大值达到22.63mm,发生在开挖时左隧道右边墙处。结合现场监控量测成果分析,证实了数值分析的正确性。基本掌握了山岭隧道洞口浅埋偏压段围岩和衬砌的变形、应力变化特征,认为该类型隧道围岩变位是隧道施工过程中需要控制的关键性因素。
Aimed at the construction problems of shallow buried bias section in the Yinzhu tunnel of Yu-Xiang Expressway, the construction process was calculated by numerical simulation. The main conclusions are as follows: the surrounding rock displacement in the horizontal direction is relatively large, which may be larger than the vertical displacement of the surrounding rock; the vertical displacement at the feature point of the surrounding rock of the right tunnel (buried depth) is larger than the left tunnel, Surrounding rock maximum displacement value reached 22.63mm, occurred at the excavation of the right tunnel at the left wall. Combined with field monitoring measurement results analysis, the correctness of numerical analysis is confirmed. It basically grasps the deformation and stress change characteristics of the surrounding rock and lining in the shallow buried biased section of the mountainous tunnel entrance. It is considered that the displacement of the surrounding rock of this type of tunnel is the key factor that needs to be controlled during the tunnel construction.